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    <p>The code you posted above worked for me (I had to write some code to create an encrypted string to pass). Compiled and run in VS2012 using .Net Framework 4.</p> <p>The encryption code I used was:</p> <pre><code> private static string EncryptStringAES(string plainText, string password, byte[] salt) { RijndaelManaged aesAlg = null; string cypherText = null; try { // generate the key from the shared secret and the salt Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(password, salt); // Create a RijndaelManaged object // with the specified key and IV. aesAlg = new RijndaelManaged(); aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8); aesAlg.IV = key.GetBytes(aesAlg.BlockSize / 8); // Create an encryptor to perform the stream transform. ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV); // Create the streams used for encryption. byte[] bytes = new UTF8Encoding().GetBytes(plainText); using (MemoryStream msEncrypt = new MemoryStream()) { using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)) { csEncrypt.Write(bytes, 0, bytes.Length); csEncrypt.FlushFinalBlock(); cypherText = Convert.ToBase64String(msEncrypt.ToArray()); } } } finally { // Clear the RijndaelManaged object. if (aesAlg != null) { aesAlg.Clear(); } } return cypherText; } </code></pre> <p>Used the following to make the method calls:</p> <pre><code> byte[] salt = new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 }; string test = DecryptStringAES(EncryptStringAES("This is a test", "Test", salt), "Test", salt); </code></pre> <p>Resulting string (Test) contained "This is a test".</p>
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    1. POAES Decryption Exception change
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    1. USKevin
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    1. COMy code works it is just 2 of the unit test do not work as they did earlier this year.
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      1. USJimmy James
    2. COI ran the above code from within a unit test (one I already had set up), just added the two calling lines and did a Debug Selected Tests from the Test Explorer.
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      1. USKevin
    3. COThe ArgumentNullException being where you indicate it is, is saying that csDecrypt is null at that point. You need to step through your code and determine why the CryptoStream is failing to get created.
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